1. A biologist discovers a new unicellular organism and isolates various components making up the organism. One component contai
ns phosphate, uracil, adenine, ribose, guanine, and cytosine. Which of the following could be the identity of this component? (1 point) DNA
repressor
tRNA
All of the above are correct.
2. Which of the following are necessary for transcription? (1 point)
RNA polymerase, DNA, ribonucleotides
DNA polymerase, RNA, deoxyribonucleotides
RNA polymerase, DNA polymerase, DNA
ribosome, tRNA, amino acids
3. What peptide would you expect to result from a 21-nucleotide-long DNA sequence that contains only the base adenine?
a peptide composed of 7 phe
a peptide composed of 21 phe
a peptide composed of 7 lys
a peptide composed of 21 lys
4. After a strain of bacterial cells is exposed to a chemical mutagen, 30% of the cells produce new colonies that continue to grow. Which of the following can be concluded?
Some cells underwent beneficial mutations.
Some cells underwent neutral mutations.
Some cells underwent lethal mutations.
All of the above are correct.
5. A DNA sequence reads -A-C-C-T-G-C-. Which of the following statements is plausible?
Mutation to -A-C-G-T-G-C- is a neutral mutation.
Mutation to -A-A-G-T-G-C- is a frameshift mutation.
Mutation to -A-C-C-T-G-T- is an advantageous mutation.
Mutation to -A-A-G-T-G-C- is a lethal mutation.
Q1. The answer is tRNA. Through the process of elimination, a repressor is a protein and, thus, consists of amino acids. On the other hand, DNA and tRNA consist of phosphate, adenine, guanine, and cytosine. However, among mentioned components, uracil and ribose are characteristic of RNAs. DNA consists of a phosphate, deoxyribose and bases: adenine, thymine, guanine, cytosine. <span>RNA (tRNA, mRNA, rRNA) consists of phosphate, ribose and bases: adenine, uracil, guanine, cytosine.</span>
Q2. The answer is RNA polymerase, DNA, ribonucleotides. Transcription is a process in which DNA sequence transcribes into messenger RNA (mRNA). RNA polymerase is an enzyme necessary for this process. It attaches to DNA sequence and helps ribonucleotides to bind to complementary bases on DNA. After mRNA is transcribed, RNA polymerase de-attaches from DNA sequence and mRNA is free.
Q3. The answer is a peptide composed of 7 <span>phe Three nucleotide bases on mRNA are called codon. Each codon codes for specific <span>amino acid. Genetic codon chart has summarised RNA codons and their amino acids. Now, we have </span></span>a 21-nucleotide-long DNA sequence that contains only the base adenine: AAAAAAAAAAAAAAAAAAAAA <span>Next, we must transcribe it into mRNA so we can read codon chart. According to the base complementarity rule, adenine will bind to uracil in RNA: DNA: </span>AAAAAAAAAAAAAAAAAAAAA RNA: UUUUUUUUUUUUUUUUUUUU We now have a 21-nucleotide-long RNA sequence that contains only the base uracil, and let separate it on triplets (three nucleotide bases): RNA: UUU-UUU-UUU-UUU-UUU-UUU-UUU After taking a look at genetic codon chart, amino acid that is appropriate for UUU triplet is Phe: RNA: UUU-UUU-UUU-UUU-UUU-UUU-UUU Protein: Phe - Phe - Phe -Phe- Phe - Phe - Phe After counting, there are 7 phe amino acids in the protein.
Q4. The answer is Some cells underwent beneficial mutations. A chemical mutagen was added to the bacterial strain in order to kill all of the bacteria. However, 30% of the bacteria survived. This means that they underwent some mutations. Since that mutation helped them survive, it had some beneficial effect on bacterial survival. Therefore, some bacteria underwent beneficial mutations.
Q5. The answer is Mutation to -A-C-C-T-G-T- is an advantageous mutation. A DNA sequence is -A-C-C-T-G-C- . It should be transcribed to mRNA sequence according to the base complementarity rule by which, in RNA, adenine will bind uracil, and guanine will bind cytosine: Normal sequence: Mutated sequence: DNA: -A-C-C-T-G-C- DNA: -A-C-C-T-G-T- RNA: -U-G-G-A-C-G- RNA: -U-G-G-A-C-A- Now, after comparing RNA triplets to amino acids in genetic codon chart: Normal sequence: Mutated sequence: RNA: -UGG-ACG- RNA: -UGG-ACA- Protein: - Trp - Thr - Protein: - Trp - Thr - This mutation might be advantageous among all other mentioned choices.
It is a connective tissue because it has high extra cellular matrix and a low number of cells. It also has many <span>Chondrocytes, and all of this points out to the fact that it's a connective tissue.</span>
<span>A simple squamous epithelium is a single layer of flat cells in contact with the basal lamina which is often extremely thin, permeable and it offers very little protection. The simple squamous epithelium is associated with filtration and diffusion and it is found in structures like the outer layer of skin, capillaries, alveoli or glomeruli.</span>
"area of square c2 = area of square a2 + area of square b2 – area of defect1 – area of defect2" is the one relationship that represents the Law of Cosines if the measure of the included angle between the sides a and b of <span>∆ABC is more than 90°. The correct option among all the options that are given in the question is option "c".</span>
God made Adam, the first man, from the dust of the ground (Gen. 2:7) and He made Eve to be a help meet for him. People lived much longer than they do now; the oldest man in the Bible is Methuselah, who lived 969 yrs (Gen. 5:27). The Flood came in Noah's days because man was doing "only evil continually"; so God saved only Noah and his family because "Noah found grace in the eyes of the Lord" (Gen 6:8). We also see in Heb.11 that Noah was a preacher of righteousness. That's only a little bit; try reading Genesis to get all the info you need about early man. I hope this helps you!